High-pressure speed of sound in pure CO 2 and in CO 2 with SO 2 as an impurity using methanol as a doping agent

Abstract

Reliable speed of sound, c, values in CO 2 -rich mixtures and pure CO 2 are required for carbon capture and storage (CCS) technology but are difficult to determine, particularly at relatively high frequencies. We tested the suitability of methanol as doping agent to obtain accurate c values in CCS systems at 5 MHz. We measured c in seven CO 2 -rich, CO 2 +methanol mixtures between 263.15 and 323.15 K and up to 196.30 MPa, and we extrapolated the values to obtain c in pure CO 2 .Additionally, we measured c from 263.15 to 373.19 K and up to 190.10 MPa in two CO 2 -rich, CO 2 +SO 2 mixtures with the same SO 2 composition, which is of interest for CCS, with one mixture doped with methanol. We compared our results for pure CO 2 with the literature and the Span and Wagner equation of state (EoS). We validated the PC-SAFT EoS and the modeling with the REFPROP 9 software for the mixtures by comparing the predicted values with our experimental data under the studied conditions. We conclude that methanol is a suitable doping agent to measure c in pure CO 2 and CO 2 -rich mixtures. For the CO 2 +SO 2 mixtures, the effect of methanol on the experimental values is small and negligible for modeling. *Manuscript Click here to download Manuscript: Revised Manuscript.docx Click here to view linked References

Influence of SO2 on CO2 Transport by Pipeline for Carbon Capture and Storage Technology: Evaluation of CO2/SO2 Cocapture

“…Caubet 58 MPa (Table S3, Figure 3, Figure S4). The data for the mixture with = 0.1031 were previously published, 33 and they are discussed below. Given that the three mixtures with < 0.1 were essentially opaque to sound in most of the studied range of pressures, we doped them with ≅ 0.8 mole % of methanol to obtain proper signals according to the method described in Rivas et al ( 2016).…”

“…37 The speed of sound of the CO2+SO2 mixtures with ≥ 0.9 can not be determined in our device, due to the acoustical opacity of CO2 at 5 MHz. 33 To obtain proper signals, we doped the mixtures with small amounts of methanol, following a previously tested method. 33 In the low- Only the thermodynamic and hydraulic aspects were taken into account in this work; the chemical effects due to the presence of SO2, such as the possibility of pipeline corrosion, primarily in the presence of water, 29,[38][39][40][41][42][43][44][45][46] were not considered.…”

“…33 To obtain proper signals, we doped the mixtures with small amounts of methanol, following a previously tested method. 33 In the low- Only the thermodynamic and hydraulic aspects were taken into account in this work; the chemical effects due to the presence of SO2, such as the possibility of pipeline corrosion, primarily in the presence of water, 29,[38][39][40][41][42][43][44][45][46] were not considered. It is well known that, while dry CO2 does not react with steel, the presence of water, even in small amounts, highly increases corrosion.…”

Estimation of Interfacial Tension for Geological CO2 Storage

“…Carbon dioxide (CO 2 ) is the major heat trapping (greenhouse) gas. In recent centuries, the average CO 2 concentration in the atmosphere was about 280 ppm, after the industrial revolution it reached the current value of 405.70 ppm (based on the Mauna Loa observatory record), which is mainly attributed to burning fossil fuels . The result is a greenhouse effect, leading to global warming and instability of polar ice sheets, which can cause physical, chemical, biological, economic, and political impacts on the environment and society.…”

Investigation on the Performances of Vuilleumier Cycle Heat Pump Adopting Mixture Refrigerants

“…Seneviratne et al [17] extended critical point literature data for methane and propane mixtures in a beta-version of REDPROP 9.2. Rivas et al [18] measured a suitable doping agent in two CO 2 -rich, CO 2 + SO 2 mixtures with the same SO 2 composition from 263.15 to 373.19 K and up to 190.10 MPa, and validated the modeling with the REFPROP 9 software.…”